Acquisitions and Divestiture (Intangible Assets) (Details) - Cinnober $ in Millions	1 Months Ended
	Jan. 31, 2019 USD ($)
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, finite-lived	$ 74
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, finite-lived	$ 67
Estimated average useful life	13 years
Amortization period of intangible assets for tax purposes	5 years
Customer relationships | Discount rate used
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Discount rate used	0.095